Installation & Maintenance
• Switch off the system and isolate the main power
supply.
• Ensure that power supply cannot be switched on
during installation.
• All electrical components must be selected as
per local standards and unit requirements.
• Refer to wiring diagram for electrical connections
details.
• Ensure that the power supply corresponds to the
unit characteristics and that the power supply
is stable (nominal voltage ±10 % and nominal
frequency ±2.5 Hz).
• Dimension the power supply cables according to
unit data for voltage and current.
• Protect the power supply and ensure correct
earthing.
• Make the power supply according to local
standards and legal requirements.
• The unit includes high and low-pressure switches
which, when activated, cut the power supply
to the compressor. Parameters for high and
low-pressure cut-outs are to be adjusted by
the installer, depending on the compressor
model, refrigerant and application. For units
with a 3-phase scroll compressor, correct phase
sequence for compressor rotation direction shall
be observed.
• Determine the phase sequence by using a phase
meter to establish the phase order of line phases
L1, L2 and L3.
• Connect line phases L1, L2 and L3 to main switch
terminals T1, T2 and T3, respectively.
• Wear protective stuff like goggles and protective
gloves.
• Never start the compressor under vacuum. Keep
the compressor switched off.
• Before charging the refrigerant, verify that the oil
level is between “¼” and “¾” on the compressor
oil sight glass. If additional oil is required, please
refer to the compressor’s label for type of oil.
• Use only the refrigerant for which the unit is
designed for.
• Fill the refrigerant in liquid phase into the
condenser or liquid receiver. Ensure a slow
charging of the system to 4-5 bar for R404A/
R507A or R22, and approx. 2 bar for R134a.
• Do not put liquid refrigerant through the suction
line.
• It is not allow to mix additives with the oil and/or
refrigerant
• The remaining charge is done until the
installation has reached a level of stable nominal
condition during operation.
• Never leave the filling cylinder connected to the
circuit.
Use safety devices (such as safety pressure
switches and mechanical relief valves) in
compliance with both generally and locally
applicable regulations and safety standards. Make
sure that the devices are operational and properly
set.
Check that the settings of high-pressure
switches and relief valves don’t exceed the
maximum service pressure of any system
component.
• Verify that all electrical connections are
properly fastened and in compliance with local
regulations.
• When a crankcase heater is required, it must be
energized at least 12 hours before initial start-up
and start-up after prolonged shut-down or belt
type crankcase heaters.
• Never start the unit when no refrigerant is
charged.
• All service valves must be in the open position.
• Check compliance between unit and power
supply.
• Check that the crankcase heater is working.
• Check that the fan can rotate freely.
• Check that the protection sheet has been
removed from the backside of condenser.
• Balance the HP/LP pressure.
• Energize the unit. It must start promptly. If
the compressor does not start, check wiring
conformity, voltage on terminals and sequence
phase.
• Eventual reverse rotation of a 3-phase
compressor can be detected by the following
phenomena: unit doesn’t start, the compressor
doesn’t build up pressure, it has abnormally
high sound level and abnormally low power
consumption. In such case, shut down the unit
immediately and connect the phases to their
proper terminals.
• If the rotation direction is correct, the low-
pressure gauge shall show a declining pressure
and the high-pressure gauge shall show an
increasing pressure.
Electrical connections
Filling the system
Verification before
commissioning
Start-up
5
FRCC.ES.013.A1.02
Manual
